folks using the rail line as opposed to the drivers using the toll roads. >> reporter: with tolls continuing to go up, some say they'll avoid the toll road all together. >> i'm going to try it. i don't know. i get on there, and it's a different price. and i don't even realize it. >> reporter: now, that's the fear, that too many drivers will get pushed off the toll road and onto local roads which are already clogged. still, other drivers say once the silver line comes online, they'll hop out of the car and onboard. at dulles international airport, adam tuss, news4. >>> when news4 at 5:00 continues, it's beginning to feel a lot like christmas. the annual holiday tradition that attracts millions each year rolls in. >>> and a big surprise at a madonna concert that has the whole crowd doing, yep, you guessed it, gangnam style. >>> enrollment in charter schools is on the rise according to the national alliance for public charter schools. there are now more than 2 million students in the alternative programs. enrollment jumped by 200,000 students in the last year alone. los angeles has the most cha